Use of anthocyanin solutions in portland cement concrete to identify carbonation depth

被引:4
|
作者
Chinchon-Paya, Servando [1 ]
Andrade, Carmen [2 ]
Chinchon, Servando [3 ]
机构
[1] Inst Eduardo Torroja Ciencias Construcc IETcc CSI, Madrid, Spain
[2] Int Ctr Numer Methods Engn CIMNE UPC, Madrid, Spain
[3] Univ Alicante, Inst Agua & Ciencias Ambientales, Alicante, Spain
关键词
Concrete; Carbonation; Anthocyanins; PH indicators;
D O I
10.1617/s11527-020-01518-4
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
A method is proposed which comprises placing a portland cement concrete or mortar sample with a harmless solution, based on a variety of anthocyanins, which acts as an indicator yielding a color which is visibly different in zones where an alkaline reserve exists (pH similar to 12) (green) from that observed in carbonated areas (pH <= 9) (blue). We firstly experimented with various solutions containing anthocyanins extracted from flowers and fruits, after which food colors commercialized in the European Union were utilized seeking to prepare a reproducible method. The tested products are three food colors coming from grape, black carrot and red cabbage obtained by means of extraction and later dehydrated by spray dying. The solutions which seem most appropriate to us contain 2.5% of color dissolved in a liquid where alcohol and water are mixed at a 70/30 ratio.
引用
收藏
页数:6
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